Have home kiln with dehumidifier...drying question.

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Forum topic by Liveedgewoodtables posted 02-16-2015 04:22 PM 875 views 0 times favorited 4 replies Add to Favorites Watch
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8 posts in 722 days

02-16-2015 04:22 PM

Topic tags/keywords: drying lumber kiln home homemade dehumidifier rh relative humidity insulated box walnut slabs 2 inch 2

I dry 2 inch thick walnut live edge slabs. I drilled two small holes in the middle of my board (to get penetration into the wood with my pin type moisture meter). The middle of my board reads 12%...the outer edge reads 5%.

The dehumidifier has RH range is 30% – 85%. The dehumidifier is not taking out anymore moisture – the outlet hose is completely dry.

Have I dried the wood all I can with this dehumidifier? Do I buy another dehumidifier the can maintain RH below 30%?

My kiln is 10’ x 4’ and 5’ high…and I followed your plans…I have four strong fans in it. These slabs were air dried for 6 months and have been in the kiln for about 4 weeks.

The slabs in the kiln now will be made into a table that will be shipped to the Midwest (Chicago).

Can you give any input?...any help is greatly appreciated.


4 replies so far

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1564 posts in 1897 days

#1 posted 02-17-2015 01:48 AM

it needs more time for the core and shell to equilibrate. Maybe a couple more weeks. Keep the dehumidifier running. You are close.

-- Danny Located in Perry, GA. Forester. Wood-Mizer LT40HD35 Sawmill. Nyle L53 Dehumidification Kiln.

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#2 posted 02-17-2015 02:08 AM

The three key elements of a kiln are relative humidity, air flow, and temperature. Add a heater and get the temp up. See if that helps.

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43 posts in 2651 days

#3 posted 02-17-2015 04:46 AM

Patience, grasshopper. Slabs take longer than lumber to reach equilibrium. The internal moisture has to migrate to the surface before it can evaporate off. That said, I woudnt be the least bit afraid to move those into a warm dry building at those MCs. It might even reach EMC faster. Airflow does little at lower MCs, its all about temp and humidity.

-- No log is too big to saw!

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8 posts in 722 days

#4 posted 02-18-2015 02:38 PM

Thanks guys for your help. At least I know I’m on the right path. the thing about leaving the dehumidifier on is that it essentially was only working as a fan towards the end…it was accumulating absolutely no moisture.

long story short..i did get impatient and pulled the slabs from the kiln and placed them in a dry building…and will be working them in a couple of weeks….and of course, will be hoping for the best.


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